Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Second Year of the War
Thus ended the campaign of 474. The separate peace which at the decisive moment Etruria had concluded with Rome, and the king's unexpected retreat which entirely disappointed the high-strung hopes of the Italian confederates, counterbalanced in great measure the impression of the victory of Heraclea.
The Italians complained of the burdens of the war, particularly of the bad discipline of the mercenaries quartered among them, and the king, weary of the petty quarrelling and of the impolitic as well as unmilitary conduct of his allies, began to have a presentiment that the problem which had fallen to him might be, despite all tactical successes, politically insoluble. The arrival of a Roman embassy of three consulars, including Gaius Fabricius the conqueror of Thurii, again revived in him for a moment the hopes of peace; but it soon appeared that they had only power to treat for the ransom or exchange of prisoners.
Pyrrhus rejected their demand, but at the festival of the Saturnalia he released all the prisoners on their word of honour. Their keeping of that word, and the repulse by the Roman ambassador of an attempt at bribery, were celebrated by posterity in a manner most unbecoming and betokening rather the dishonourable character of the later, than the honourable feeling of that earlier, epoch.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=32